API and build change and fix summaries. Doc correctsions
and/or changes are not mentioned here; see the commit messages.
+2019 October 31; version 1.10.2
+ Provide the means to increase the payload size of a received message
+ without losing the data needed to use the rmr_rts_msg() funciton.
+
2019 October 21; version 1.10.1
Fix to prevent null message buffer from being returned by the timeout
receive function if the function is passed one to reuse.